Direct connect Avaya HIS cord (part number 72442-41, formerly 72442-01) for headsets connecting to the Avaya Models listed above. Use this Avaya HIS cord to connect any Plantronics H-series headset directly to your telephone headset port. This provides you with "on-hook" functionality so that you won't have to lift your telephone handset off the receiver for every call when using your Plantronics headset. Please only purchase this cable if you have one of the phone models specifically listed above. You will NOT need to purchase a Plantronics external amplifier if you have one of the listed phone models. This cord is all you need to connect your Plantronics H-series headset to your phone. The cord has a modular plug at one end and a QuickDisconnect at the other end which connects to any H-series headset.